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Snowcat [4.5K]
4 years ago
6

An environmental change causes the

Biology
1 answer:
Feliz [49]4 years ago
5 0

Answer:

The correct option is<u> slight increase in salt concentration in the </u>

<u>environment.</u>

Explanation:

The main function of contractile vacuole in the body of a paramecium is to pump out excess water. But an increase in salt concentration in the environment will let the water move inside the cell by osmosis. Hence, the contractile vacuole will not perform its function and will not be able to regulate osmoregulation.

Other options are incorrect because slight changes in the temperature or pH won't affect the contractile vacuole and it will still be able to perform its function.

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DNA is made up the nucleotide bases: A C G U and RNA is made up the nucleotide bases A T C G
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Answer: FALSE

Explanation: it is actually the opposite!

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How are continental and oceanic plates different
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The continental plate is thicker and less dense while the oceanic plate is thinner and more dense.

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Which statements describe the mercalli scale select two options
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This scale rates an earthquake according to how much damage it causes. This scale produces a single rating for earthquakes that reach the surface. This scale uses Roman numerals to rank the damage caused by an earthquake. This scale measures the magnitude of an earthquake based on the size of seismic waves. ithink all i got the most i cud do gl

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If you were to try and pair a thymine with a cytosine (a non Watson-Crick base pairing), then would you expect to see any stabil
Artyom0805 [142]

Answer:

Yes, two hydrogen bonds could form between thymine and cytosine.

Explanation:

Cytosine is a pyrimidine base found in both DNA and RNA, and Thymine is a pyrimidine base found in only DNA. Electronegative Oxygen and Nitrogen atoms with free lone pairs are potential hydrogen bond acceptors. Hydrogen atoms attached to very electronegative atoms like Oxygen and Nitrogen have strong partial positive charge and are potential hydrogen bond donors.

One hydrogen bond could form between the C4 carbonyl group on thymine which is a hydrogen bond acceptor and the C4 amino group on cytosine which is a hydrogen bond donor. Also, another hydrogen bond could be formed between N3 of thymine which is a hydrogen bond donor and the N3 of cytosine that is a hydrogen bond acceptor.

It is important to note that hydrogen bond cannot be formed between them because the C2 carbonyl groups found on both bases are both hydrogen bond acceptors.

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4 years ago
In a population with 2 alleles for a particular locus (D and d), the frequency of the D allele is 0.75.
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